package com.holly.common_view.adapter;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * RecyclerView分割线
 * 2016/11/17 <br/>
 *
 * @author Joey Huang QQ:273179370）
 */

public class PaddingDivider extends RecyclerView.ItemDecoration {
    public static final int DEFAULT_PADDING = 20;
    public static final int DEFAULT_SIZE = 1;
    public static final int DEFAULT_COLOR = Color.parseColor("#24000000");

    private int mPaddingStart;
    private int mPaddingEnd;
    private int mSize;
    private int mColor;
    private final Paint mPaint;


    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;

    public PaddingDivider(Context context, int orientation) {
        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
        setOrientation(orientation);
        mPaint = new Paint();
        init();
    }

    private void init() {
        mPaddingStart = DEFAULT_PADDING;
        mPaddingEnd = DEFAULT_PADDING;
        mSize = DEFAULT_SIZE;
        mColor = DEFAULT_COLOR;
    }

    public int getPaddingStart() {
        return mPaddingStart;
    }

    public int getPaddingEnd() {
        return mPaddingEnd;
    }

    public int getSize() {
        return mSize;
    }

    public void setSize(int size) {
        mSize = size;
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    public void drawVertical(Canvas canvas, RecyclerView parent) {
        mPaint.setColor(mColor);
        final int left = mPaddingStart;
        final int right = parent.getWidth() - mPaddingEnd;
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mSize;
            mDivider.setBounds(left, top, right, bottom);
            canvas.drawLine(left, top, right, bottom, mPaint);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop() + mPaddingStart;
        final int bottom = parent.getHeight() - parent.getPaddingBottom() - mPaddingEnd;
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDivider.getIntrinsicHeight();
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }

    @Override
    public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
        if (mOrientation == VERTICAL_LIST) {
            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
        } else {
            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
        }
    }

    public void setPaddingStart(int paddingStart) {
        if (paddingStart < 0) {
            throw new IllegalArgumentException("paddingStart 不能小于0!");
        }
        mPaddingStart = paddingStart;
    }

    public void setPaddingEnd(int paddingEnd) {
        if (paddingEnd < 0) {
            throw new IllegalArgumentException("paddingEnd 不能小于0!");
        }
        mPaddingEnd = paddingEnd;
    }
}
